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SUMMARY:Minimality versus naturalness: How many new particles do we need?
DTSTART:20260414T141500Z
DTEND:20260414T153000Z
DTSTAMP:20260420T042500Z
UID:indico-event-5781@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Mikhail Shaposhnikov (EPFL)\n\n\n\nProgram:16:15 IRM
 P Colloquium talk at CYCL0117:30 Drinks and snacks with the speaker in the
  Cyclofette\n\n\nAbout the speaker:Mikhail Shaposhnikov has made numerous 
 contributions to theoretical particle physics and cosmology that shaped th
 ese fields. Most notably\, he has contributed to the foundations of electr
 oweak baryogenesis and leptogenesis\, was amongst the first to propose bra
 ne worlds\, made important contributions to thermal field theory\, and fir
 st pointed out that the Higgs boson could drive cosmic inflation. More rec
 ently\, he has contributed to CERN's experimental program as one of the or
 iginal proposers of the SHiP experiment and by highlighting the FCC-ee's p
 otential to discover long-lived particles. Summary:Nature contains severa
 l seemingly independent mass scales. The smallest of them is associated wi
 th the accelerated expansion of the Universe which can be explained by the
  vacuum energy $(\\epsilon_V)^{\\frac{1}{4}}\\sim 2.26\\times 10^{-3}$ eV.
  The next one is the QCD confinement scale\, establishing the typical size
  of hadrons\, $\\Lambda_{QCD} \\sim 100$ MeV.  The Fermi scale is related
  to the mass of the weak intermediate vector bosons\, $M_W \\sim 100$ GeV.
  The largest scale is associated with the strength of the gravitational in
 teractions given by the Planck mass $M_P\\sim 10^{19}$ GeV. I will discuss
  whether the multitude of these scales scattered by many orders of magnitu
 de implies the existence of new particles and forces yet to be discovered 
 and deliberate on the question formulated in the title.\n\nhttps://agenda.
 irmp.ucl.ac.be/event/5781/
LOCATION:CYCL01 (Marc de Hemptinne (chemin du Cyclotron\, 2\, Louvain-la-N
 euve))
URL:https://agenda.irmp.ucl.ac.be/event/5781/
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